Beechjet be-400 captain reported that a runaway trim event occurred during cruise. The flight crew w...

Attributes
ACN	1720080
Time
Date	202001
Local Time Of Day	1201-1800
Place
Locale Reference	ZJX.ARTCC
State Reference	FL
Aircraft 1
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Elevator Trim System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 137 Flight Crew Total 15756 Flight Crew Type 3243
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

Flying from ZZZ to ZZZ1; 35 miles south from jax at FL410; the airplane's nose went to a descent; I disconnected the autopilot and abruptly nose went to a 25 degrees nose down attitude. Crew started trying to get the airplane under control; we called center and let them know of our situation and they cleared us to FL350; we told them that we couldn't level off so they cleared us to 15;000 ft. The memory items for runaway trim was accomplished and we got the airplane's control back; that was descending through FL350. We requested vectors to the nearest suitable airport so were vectored to jax. Weather at jax was VFR. Approach and landing performed with no problem.

Original NASA ASRS Text

Title: Beechjet BE-400 Captain reported that a runaway trim event occurred during cruise. The flight crew was able to regain aircraft control and make a successful diversion and landing.

Narrative: Flying From ZZZ to ZZZ1; 35 miles south from JAX at FL410; the airplane's nose went to a descent; I disconnected the autopilot and abruptly nose went to a 25 degrees nose down attitude. Crew started trying to get the airplane under control; we called Center and let them know of our situation and they cleared us to FL350; we told them that we couldn't level off so they cleared us to 15;000 ft. The memory items for runaway trim was accomplished and we got the airplane's control back; that was descending through FL350. We requested vectors to the nearest suitable airport so were vectored to JAX. Weather at JAX was VFR. Approach and landing performed with no problem.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Beechjet be-400 captain reported that a runaway trim event occurred during cruise. The flight crew was able to regain aircraft control and make a successful diversion and landing.